Dsp
http://www.maximintegrated.com/app-notes/index.mvp/id/733
http://www.katjaas.nl/home/home.html
Vowels: ECE 4760 Spring 2011 A Smart Voice Decoder System for Vowels
http://people.ece.cornell.edu/land/courses/ece4760/FinalProjects/s2011/wd65_yz526/wd65%20and%20yz526/index.html
PitchDetect
http://stackoverflow.com/questions/1354084/real-time-pitch-detection <— C Algo
http://www.cse.ohio-state.edu/~dwang/papers/HWJ.icassp11.pdf <— 4 methods PDF
https://ccrma.stanford.edu/~pdelac/154/m154paper.htm <— JOS
https://github.com/ashokfernandez/Yin-Pitch-Tracking <— C Algo
http://psi.cse.tamu.edu/teaching/lecture_notes/ <— good formant filter expose
https://ccrma.stanford.edu/software/clm/compmus/clm-tutorials/addsynth2.html